| Agriculture, Forestry & Soils |
Q: How would you research the best way to design an environmentally friendly town center? I am a teacher planning a project for an environmental science class. The town center would include a movie theatre, stores, restaurants, a park and an art center.
A: Designing an environmentally friendly town center is a rich and complex topic. From global environmental quality to biodiversity of local streams to individual health and fitness, urban design profoundly impacts many relationships between people and their environment.
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| Computing & Information Technology |
Q: What are the advantages and disadvantages of MPEG-2 and MPEG-4?
A: MPEG-2 and MPEG-4 are international standards for compressing video signals. They are widely used in digital television broadcasting, DVDs, and mobile videophony. MPEG-2 and MPEG-4 offer several advantages over proprietary encoding and decoding algorithms, or codecs.
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| Physics |
Q: What are magnetic heat engines?
A: A magnetic heat engine converts heat into work, or vice versa taking advantage of the relationships between the magnetic properties of materials and the temperature. One promising application of magnetic heat engines is magnetic cooling. When a magnetic metal passes through the magnetic field it heats up, and it cools as it leaves the magnetic field. These repeatable temperature changes are at the foundation of magnetic cooling.
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